Which lining material is commonly used in window treatments?

Cotton sateen is commonly used as a lining material for window treatments due to its smooth and soft finish, which enhances the aesthetic appeal of the curtains or drapes. This fabric type provides a good balance between durability and comfort, making it an excellent choice to protect the main fabric from sunlight and dust, while also providing a nice drape. Additionally, cotton sateen has a slight sheen that can help to enhance the overall look of window treatments without overwhelming the primary fabric's design.

The other materials listed, while useful in various textile applications, are less frequently chosen for lining. Silk velvet, for instance, is luxurious but can be costly and bulky for a lining. Linen fabric, while breathable and textured, may not provide the same level of light filtration and protection as cotton sateen. Nylon canvas is typically heavier and more suited for outdoor applications rather than the soft, elegant nature desirable in interior window treatments.